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TABLE OF CONTENTS SWRCB Requirement for VPH Communication TOP OFF METHOD TANK SUMPS ............................................................................................ 1. VACUUM METHOD TANK SUMPS.............................................................................................. 2. TOP OFF METHOD UDC SUMPS............................................................................................... 3. VACUUM METHOD UDC SUMPS............................................................................................... 4. SUMP SHOWING COMMUNICATION......................................................................................... 5. A D interstice sump will require 2 sensors. One sensor, which resides in a bung supplied in the UDN to monitor the integrity of the interstice. The second sensor is to monitor liquid level that the sump itself is catching and sits open to the bottom. For a Dry Interstice Sumps, there is a requirement for 2 monitoring sensors. One is to monitor the interior of the sump liquid level that the sump itself is containing in a breach it shall be positioned in the open bottom at the lowest point of a sump. State Water Board for VPH Communication testing on VPH components stems from demonstrating that the monitoring system is "capable of detecting the entry of the liquid- or vapor-phase of the hazardous substance stored in the primary containment into the secondary containment and capable of detecting water intrusion into the secondary containment." In addition, "the interstitial space of the underground storage tank shall be maintained under constant vacuum or pressure such that a breach in the primary or secondary containment is detected before the liquid or vapor phase of the hazardous substance stored in the underground storage tank is released into the environment." re ealth and Safety Code, div.3, ch. 6.7, §§ 25290.1(d)&(e).) sting communication during a monitoring system certification is necessary to make sure that the monitoring system is working as required by UST requirements and is monitoring the entire containment. As you know, installation, testing, maintenance, and operation of UST components should follow manufacturer guidelines. I see no problems with your proposed method of testing for communication on your sumps. 0�9) PROBLEM SOLVED I.